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        <section id="main"><article id="post-广播机制/广播机制--发送自定义广播" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
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      发送自定义广播
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        <blockquote>
<p>发送自定义广播  </p>
</blockquote>
<span id="more"></span>  

<h4 id="发送标准广播"><a href="#发送标准广播" class="headerlink" title="发送标准广播"></a>发送标准广播</h4><p>在发送广播之前，我们还是需要先定义一个广播接收器来准备接收此广播才行，不然发<br>出去也是白发.  </p>
<p>1 新建一个应用项目BroadcastTest1   </p>
<p>2 新建一个 MyBroadcastReceiver继承自 BroadcastReceiver.   </p>
<pre><code class="java">import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

/**
 * 自定义一个广播接收器,
 */
public class MyBroadcastReceiver extends BroadcastReceiver &#123;
    @Override
    public void onReceive(Context context, Intent intent) &#123;
        Toast.makeText(context, &quot;收到自己的广播了&quot;, 0).show();
    &#125;
&#125;  
</code></pre>
<p>3 在 AndroidManifest.xml 中对这个广播接收器进行注册  </p>
<pre><code>&lt;receiver android:name=&quot;com.yassblog.bootreceiver.MyBroadcastReceiver&quot; &gt;
    &lt;intent-filter&gt;
        &lt;action android:name=&quot;com.example.broadcasttest.MY_BROADCAST&quot; /&gt;
    &lt;/intent-filter&gt;
&lt;/receiver&gt;  
</code></pre>
<p>可以看到，这里让 MyBroadcastReceiver 接收一条值为com.example.broadcasttest.MY_BROADCAST的广播，因此待会儿在发送广播的时候，我们就需要发出这样的一条广播.    </p>
<p>4 修改 MainActivity 中的代码, 并修改布局文件.  </p>
<pre><code class="java">import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity &#123;

    @Override
    protected void onCreate(Bundle savedInstanceState) &#123;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new OnClickListener() &#123;
            @Override
            public void onClick(View v) &#123;
                Intent intent = new 
                    Intent(&quot;com.example.broadcasttest.MY_BROADCAST&quot;);
                sendBroadcast(intent);
            &#125;
        &#125;);
    &#125;
&#125;  
</code></pre>
<p>可以看到，我们在按钮的点击事件里面加入了发送自定义广播的逻辑。首先构建出了一个 Intent 对象，并把要发送的广播的值传入，然后调用了 Context 的 sendBroadcast()方法将广播发送出去，这样所有监听 com.example.broadcasttest.MY_BROADCAST 这条广播的广播接收器就会收到消息。此时发出去的广播就是一条标准广播.  </p>
<p>activity_main.xml布局文件  </p>
<pre><code>&lt;LinearLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    android:layout_width=&quot;match_parent&quot;
    android:layout_height=&quot;match_parent&quot; &gt;

    &lt;Button
        android:id=&quot;@+id/button&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:text=&quot;发送广播&quot; /&gt;

&lt;/LinearLayout&gt;  
</code></pre>
<p>5 重新运行程序，并点击一下按钮, 查看效果.  </p>
<p>另外，由于广播是使用 Intent 进行传递的，因此你还可以在 Intent 中携带一些数据传递给广播接收器。  </p>
<h4 id="发送有序广播"><a href="#发送有序广播" class="headerlink" title="发送有序广播"></a>发送有序广播</h4><p>广播是一种可以跨进程的通信方式，因此在我们应用程序内发出的广播，其他的应用程序应该也是可以收到的。  </p>
<p>为了验证这一点，我们需要再新建一个应用项目BroadcastTest2 。 </p>
<p>1 新建 AnotherBroadcastReceiver 继承自 BroadcastReceiver .  </p>
<pre><code class="java">import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

/**
 * 自定义一个广播接收器,
 */
public class AnotherBroadcastReceiver extends BroadcastReceiver &#123;
    @Override
    public void onReceive(Context context, Intent intent) &#123;
        Toast.makeText(context, &quot;收到另个应用的广播了&quot;, 0).show();
    &#125;
&#125;  
</code></pre>
<p>2 在AndroidManifest.xml 中对这个广播接收器进行注册.  </p>
<pre><code>&lt;receiver android:name=&quot;com.yasscs.bootreceiver.AnotherBroadcastReceiver&quot; &gt;
    &lt;intent-filter&gt;
        &lt;action android:name=&quot;com.example.broadcasttest.MY_BROADCAST&quot; /&gt;
    &lt;/intent-filter&gt;
&lt;/receiver&gt;  
</code></pre>
<p>可以看到，AnotherBroadcastReceiver 同样接收的是 com.example.broadcasttest.MY_BROADCAST 这条广播.  </p>
<p>3 将两个项目运行到手机上,点击项目1中的按钮,会发现收到两次吐司提示. 说明项目1发出的广播不但自己收到了, 项目2也同样收到了.   </p>
<h4 id="不过到目前为止，程序里发出的都还是标准广播，现在我们来尝试一下发送有序广播。"><a href="#不过到目前为止，程序里发出的都还是标准广播，现在我们来尝试一下发送有序广播。" class="headerlink" title="不过到目前为止，程序里发出的都还是标准广播，现在我们来尝试一下发送有序广播。"></a>不过到目前为止，程序里发出的都还是标准广播，现在我们来尝试一下发送有序广播。</h4><p>1 修改项目1的 MainActivity 代码.  </p>
<pre><code class="java">import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity &#123;

    @Override
    protected void onCreate(Bundle savedInstanceState) &#123;
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new OnClickListener() &#123;
            @Override
            public void onClick(View v) &#123;
                Intent intent = new 
                    Intent(&quot;com.example.broadcasttest.MY_BROADCAST&quot;);
                // 发送有序广播
                sendOrderedBroadcast(intent,null);
            &#125;
        &#125;);
    &#125;
&#125;  
</code></pre>
<p>可以看到，发送有序广播只需要改动一行代码，即将 sendBroadcast()方法改成sendOrderedBroadcast()方法。sendOrderedBroadcast()方法接收两个参数，第一个参数仍然是Intent，第二个参数是一个与权限相关的字符串，这里传入 null 就行了。现在重新运行程序，并点击按钮，你会发现，两个应用程序仍然都可以接收到这条广播 .  </p>
<p>看上去好像和标准广播没什么区别嘛，不过别忘了，这个时候的广播接收器是有先后顺序的，而且前面的广播接收器还可以将广播截断，以阻止其继续传播。  </p>
<p>那么该如何设定广播接收器的先后顺序呢？当然是在注册的时候进行设定的了.    </p>
<p>2 修改项目1的 AndroidManifest.xml 中的代码  </p>
<pre><code>&lt;receiver android:name=&quot;com.yassblog.bootreceiver.MyBroadcastReceiver&quot; &gt;
    &lt;intent-filter android:priority=&quot;100&quot; &gt;
        &lt;action android:name=&quot;com.example.broadcasttest.MY_BROADCAST&quot; /&gt;
    &lt;/intent-filter&gt;
&lt;/receiver&gt;    
</code></pre>
<p>可以看到，我们通过 android:priority 属性给广播接收器设置了优先级，优先级比较高的广播接收器就可以先收到广播。这里将 MyBroadcastReceiver 的优先级设成了 100，以保证它一定会在 AnotherBroadcastReceiver 之前收到广播。  </p>
<p>既然已经获得了接收广播的优先权，那么 MyBroadcastReceiver 就可以选择是否允许广播继续传递了。  </p>
<p>3 修改项目1的 MyBroadcastReceiver 中的代码  </p>
<pre><code class="java">import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

/**
 * 自定义一个广播接收器,
 */
public class MyBroadcastReceiver extends BroadcastReceiver &#123;
    @Override
    public void onReceive(Context context, Intent intent) &#123;
        Toast.makeText(context, &quot;收到自己的广播了&quot;, 0).show();
        // 截断广播
        abortBroadcast();
    &#125;
&#125;  
</code></pre>
<p>如果在 onReceive()方法中调用了 abortBroadcast()方法，就表示将这条广播截断，后面的广播接收器将无法再接收到这条广播。现在重新运行程序，并点击一下按钮，你会发现，只有 MyBroadcastReceiver 中的 Toast 信息能够弹出，说明这条广播经过 MyBroadcastReceiver 之后确实是终止传递了。 </p>

      
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